<h2>Problem 15</h2>
<div style="color:#666;font-size:80%;">19 April 2002</div><br />
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<p>Starting in the top left corner of a 2<img src='images/symbol_times.gif' width='9' height='9' alt='&times;' border='0' style='vertical-align:middle;' />2 grid, there are 6 routes (without backtracking) to the bottom right corner.</p>
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<img src="project/images/p_015.gif" alt="" />
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<p>How many routes are there through a 20<img src='images/symbol_times.gif' width='9' height='9' alt='&times;' border='0' style='vertical-align:middle;' />20 grid?</p>

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